That Quiz is a neat site that tests you on geography, vocabulary in four languages, science and a wide variety of math concepts. The site has been around for many years but I just Stumbled Upon it yesterday. There are 38 different categories that you can be quizzed on and 26 of them are math based. Each quiz allows you adjust the change parameters by setting timers, levels of difficulty and other factors according to what category you choose. Whether you teach math, science, languages, or geography, That Quiz is a great site for teachers to use in the class and for students to use at home.